I am sure there are E-Books available on those, and even more actual Books available in you Local Shops. Though I recommend W3C School and Tutorialized.com Personally.
There is a virtue in learning/using XHTML -- it enforces well-formed Markup. On the other hand, if you employ well formed Markup as a matter of course or habit, there is nothing to be gained by using XHTML (in fact you have to use a lot of extra header code). XHTML is, and has been, a broken implementation -- being served, as it is, as HTML. Visit the link in my signature block. James
Interesting James - Do you know if they have plans for IE8 to serve XHTML content (MIME) type application/xhtml+xml correctly?
The scuttlebutt is that it won't, Heath -- but the answer is elusive at present. BTW, if you missed it, here is an XHTML 1.0 page served as application/xhtml+xml and with XML compliant CSS -- just to play around with. James